Function AbstractModel

Mark a class as an abstract base model.

An abstract model gets no table of its own. Its columns, and any @PrimaryKey / @Default / validation applied to them, are inherited by the concrete models that extend it, so shared fields are declared once:

// This is the base model, which defines the common fields between all comments.
@AbstractModel()
class BaseComment {
  @Column(DataTypes.INTEGER())
  @PrimaryKey()
  @AutoIncrement()
  declare id: number;

  @Column(DataTypes.TEXT())
  declare body: string;
}

@Table({ tableName: 'post_comments' })
class PostComment extends BaseComment {
  @Column(DataTypes.INTEGER())
  declare postId: number;
}
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PostComment is created with id, body and postId. Passing the abstract class itself to addModel() is an error - there is no table to address.